From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752837AbdLKMGU (ORCPT ); Mon, 11 Dec 2017 07:06:20 -0500 Received: from mout.kundenserver.de ([212.227.126.133]:56953 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751281AbdLKMGS (ORCPT ); Mon, 11 Dec 2017 07:06:18 -0500 From: Arnd Bergmann To: Michael Krufky , Mauro Carvalho Chehab Cc: Arnd Bergmann , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] tuners: tda8290: reduce stack usage with kasan Date: Mon, 11 Dec 2017 13:06:04 +0100 Message-Id: <20171211120612.3775893-1-arnd@arndb.de> X-Mailer: git-send-email 2.9.0 X-Provags-ID: V03:K0:mCt58DEA9E7mVigTBPagnvUhHlRQoWkCgwzBXyuYeWT9qsmGEYw y9cEHSXqWbsryVvIxNoI8KVQ8WIAS5YWMJWWV3USzhGVmcrIw8WDh3uzLzcj7jIP4VgUzY9 04jD+eLEXkaRYfZTWu7WFrgS2Z+i1q8ykAA2UkkzUXW8/p8+NRGsjwI3jnFUq8+u7Q/OInn eZZu/dboxuDosQtJy9g4w== X-UI-Out-Filterresults: notjunk:1;V01:K0:X/8l4/BcIxw=:INAGisPJLY+0LDXmaOlWhf 8FDT7IZmOp2Qe+9DUvvexs4uRooqEzJrbn+5pMrwnCt+giRIOcfrqSbuYl5Aj0YZJdnrvYe4E dupyKcCR8zG1HYeHuAI+GV6Q1hSqH3V3e/1AvNTZDkkemf0/9oSQgjoU7zJDd9n5e5aUike2Z Y+K/R0PLExvKvRH3yrhLLTA0uDRsVptO5hR8r4sW4xnwk58KBWioHIW4eRLrIuu4DPHRpRoOy i17zXcRxacaUkGKZ1Rm0eO1SbqW2UxbK4vjCvAkgJoifvU3QmhygsDfzv1g/Lm3KvVo64FfGA Emaqad9YlfDY7QhDNLyOsiywjjFKe1C5izT61aWGb16YxquHXHiJTen9dTOcYN8rmLhLjDwcu GNgw0d6e4kkYVg2wAsLcvD3JSvZLvvvdPFAIGxKcnYXKmOt35l+FADGuKdgEKpLecfRfuS6w3 AQzfIu9A/mdQe1vOlN1dA9ZV7q3kS1Myqlg45zfVkIPbP8gFmM9XGY4YNECeklhmkWVMtfZCI 3aty+PYyD/N6bG+Ty4wViAYEn+xbvusrb6Uhbi56QbU+nDacFqlAlWut+ZJVdlntMWpxEkZiG PC/dxSEUn8p3vjcbS2buB+/qD9uqOgiR44tR0kHngi/RR1kahitP4FlOKCT/MRcas+ni/QUFB VbzlyEhhYCcHlh1esEcVmlPgET2jhP1dpBtjehWdU8W1j9d+jYns5rwHllym+OUZGDSqQZ6sO LOFsjZrJUWTKyVKcWnAKFU+MEEiorDnoElJVJQ== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With CONFIG_KASAN enabled, we get a relatively large stack frame in one function drivers/media/tuners/tda8290.c: In function 'tda8290_set_params': drivers/media/tuners/tda8290.c:310:1: warning: the frame size of 1520 bytes is larger than 1024 bytes [-Wframe-larger-than=] With CONFIG_KASAN_EXTRA this goes up to drivers/media/tuners/tda8290.c: In function 'tda8290_set_params': drivers/media/tuners/tda8290.c:310:1: error: the frame size of 3200 bytes is larger than 3072 bytes [-Werror=frame-larger-than=] We can significantly reduce this by marking local arrays as 'static const', and this should result in better compiled code for everyone. I have another patch for the same symptom to patch tuner_i2c_xfer_*, and we actually want both of them. Signed-off-by: Arnd Bergmann --- drivers/media/tuners/tda8290.c | 76 ++++++++++++++++++++++-------------------- 1 file changed, 39 insertions(+), 37 deletions(-) diff --git a/drivers/media/tuners/tda8290.c b/drivers/media/tuners/tda8290.c index a59c567c55d6..19854221b72d 100644 --- a/drivers/media/tuners/tda8290.c +++ b/drivers/media/tuners/tda8290.c @@ -63,8 +63,8 @@ static int tda8290_i2c_bridge(struct dvb_frontend *fe, int close) { struct tda8290_priv *priv = fe->analog_demod_priv; - unsigned char enable[2] = { 0x21, 0xC0 }; - unsigned char disable[2] = { 0x21, 0x00 }; + static unsigned char enable[2] = { 0x21, 0xC0 }; + static unsigned char disable[2] = { 0x21, 0x00 }; unsigned char *msg; if (close) { @@ -84,9 +84,9 @@ static int tda8295_i2c_bridge(struct dvb_frontend *fe, int close) { struct tda8290_priv *priv = fe->analog_demod_priv; - unsigned char enable[2] = { 0x45, 0xc1 }; - unsigned char disable[2] = { 0x46, 0x00 }; - unsigned char buf[3] = { 0x45, 0x01, 0x00 }; + static unsigned char enable[2] = { 0x45, 0xc1 }; + static unsigned char disable[2] = { 0x46, 0x00 }; + static unsigned char buf[3] = { 0x45, 0x01, 0x00 }; unsigned char *msg; if (close) { @@ -178,24 +178,24 @@ static void tda8290_set_params(struct dvb_frontend *fe, { struct tda8290_priv *priv = fe->analog_demod_priv; - unsigned char soft_reset[] = { 0x00, 0x00 }; + static unsigned char soft_reset[] = { 0x00, 0x00 }; unsigned char easy_mode[] = { 0x01, priv->tda8290_easy_mode }; - unsigned char expert_mode[] = { 0x01, 0x80 }; - unsigned char agc_out_on[] = { 0x02, 0x00 }; - unsigned char gainset_off[] = { 0x28, 0x14 }; - unsigned char if_agc_spd[] = { 0x0f, 0x88 }; - unsigned char adc_head_6[] = { 0x05, 0x04 }; - unsigned char adc_head_9[] = { 0x05, 0x02 }; - unsigned char adc_head_12[] = { 0x05, 0x01 }; - unsigned char pll_bw_nom[] = { 0x0d, 0x47 }; - unsigned char pll_bw_low[] = { 0x0d, 0x27 }; - unsigned char gainset_2[] = { 0x28, 0x64 }; - unsigned char agc_rst_on[] = { 0x0e, 0x0b }; - unsigned char agc_rst_off[] = { 0x0e, 0x09 }; - unsigned char if_agc_set[] = { 0x0f, 0x81 }; - unsigned char addr_adc_sat = 0x1a; - unsigned char addr_agc_stat = 0x1d; - unsigned char addr_pll_stat = 0x1b; + static unsigned char expert_mode[] = { 0x01, 0x80 }; + static unsigned char agc_out_on[] = { 0x02, 0x00 }; + static unsigned char gainset_off[] = { 0x28, 0x14 }; + static unsigned char if_agc_spd[] = { 0x0f, 0x88 }; + static unsigned char adc_head_6[] = { 0x05, 0x04 }; + static unsigned char adc_head_9[] = { 0x05, 0x02 }; + static unsigned char adc_head_12[] = { 0x05, 0x01 }; + static unsigned char pll_bw_nom[] = { 0x0d, 0x47 }; + static unsigned char pll_bw_low[] = { 0x0d, 0x27 }; + static unsigned char gainset_2[] = { 0x28, 0x64 }; + static unsigned char agc_rst_on[] = { 0x0e, 0x0b }; + static unsigned char agc_rst_off[] = { 0x0e, 0x09 }; + static unsigned char if_agc_set[] = { 0x0f, 0x81 }; + static unsigned char addr_adc_sat = 0x1a; + static unsigned char addr_agc_stat = 0x1d; + static unsigned char addr_pll_stat = 0x1b; unsigned char adc_sat, agc_stat, pll_stat; int i; @@ -468,9 +468,9 @@ static void tda8290_standby(struct dvb_frontend *fe) { struct tda8290_priv *priv = fe->analog_demod_priv; - unsigned char cb1[] = { 0x30, 0xD0 }; - unsigned char tda8290_standby[] = { 0x00, 0x02 }; - unsigned char tda8290_agc_tri[] = { 0x02, 0x20 }; + static unsigned char cb1[] = { 0x30, 0xD0 }; + static unsigned char tda8290_standby[] = { 0x00, 0x02 }; + static unsigned char tda8290_agc_tri[] = { 0x02, 0x20 }; struct i2c_msg msg = {.addr = priv->tda827x_addr, .flags=0, .buf=cb1, .len = 2}; if (fe->ops.analog_ops.i2c_gate_ctrl) @@ -495,9 +495,9 @@ static void tda8290_init_if(struct dvb_frontend *fe) { struct tda8290_priv *priv = fe->analog_demod_priv; - unsigned char set_VS[] = { 0x30, 0x6F }; - unsigned char set_GP00_CF[] = { 0x20, 0x01 }; - unsigned char set_GP01_CF[] = { 0x20, 0x0B }; + static unsigned char set_VS[] = { 0x30, 0x6F }; + static unsigned char set_GP00_CF[] = { 0x20, 0x01 }; + static unsigned char set_GP01_CF[] = { 0x20, 0x0B }; if ((priv->cfg.config == TDA8290_LNA_GP0_HIGH_ON) || (priv->cfg.config == TDA8290_LNA_GP0_HIGH_OFF)) @@ -539,10 +539,12 @@ static void tda8295_init_if(struct dvb_frontend *fe) static void tda8290_init_tuner(struct dvb_frontend *fe) { struct tda8290_priv *priv = fe->analog_demod_priv; - unsigned char tda8275_init[] = { 0x00, 0x00, 0x00, 0x40, 0xdC, 0x04, 0xAf, - 0x3F, 0x2A, 0x04, 0xFF, 0x00, 0x00, 0x40 }; - unsigned char tda8275a_init[] = { 0x00, 0x00, 0x00, 0x00, 0xdC, 0x05, 0x8b, - 0x0c, 0x04, 0x20, 0xFF, 0x00, 0x00, 0x4b }; + static unsigned char tda8275_init[] = + { 0x00, 0x00, 0x00, 0x40, 0xdC, 0x04, 0xAf, + 0x3F, 0x2A, 0x04, 0xFF, 0x00, 0x00, 0x40 }; + static unsigned char tda8275a_init[] = + { 0x00, 0x00, 0x00, 0x00, 0xdC, 0x05, 0x8b, + 0x0c, 0x04, 0x20, 0xFF, 0x00, 0x00, 0x4b }; struct i2c_msg msg = {.addr = priv->tda827x_addr, .flags=0, .buf=tda8275_init, .len = 14}; if (priv->ver & TDA8275A) @@ -834,11 +836,11 @@ int tda829x_probe(struct i2c_adapter *i2c_adap, u8 i2c_addr) .addr = i2c_addr, }; - unsigned char soft_reset[] = { 0x00, 0x00 }; - unsigned char easy_mode_b[] = { 0x01, 0x02 }; - unsigned char easy_mode_g[] = { 0x01, 0x04 }; - unsigned char restore_9886[] = { 0x00, 0xd6, 0x30 }; - unsigned char addr_dto_lsb = 0x07; + static unsigned char soft_reset[] = { 0x00, 0x00 }; + static unsigned char easy_mode_b[] = { 0x01, 0x02 }; + static unsigned char easy_mode_g[] = { 0x01, 0x04 }; + static unsigned char restore_9886[] = { 0x00, 0xd6, 0x30 }; + static unsigned char addr_dto_lsb = 0x07; unsigned char data; #define PROBE_BUFFER_SIZE 8 unsigned char buf[PROBE_BUFFER_SIZE]; -- 2.9.0